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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 e.g. APEL and R-GMA R-GMA structure used in accounting system (GOCDB) For gLite the sensors are provided by DGAS via DGAS2APEL the EGEE portal for accounting data is provided by CESGA Middleware

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 (measured by UK Tier-1 for all VOs) ~90% CPU efficiency due to i/o bottlenecks is OK Concern that this is currently ~75% Efficiency Each experiment needs to work to improve their system/deployment practice anticipating e.g. hanging gridftp connections during batch work target

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 (is still an issue for Tier-1 and Tier-2s) http://www.gridpp.ac.uk/storage/status/gridppDiscStatus.html Utilisation is low (~30%) at T2s and accounting [by VO] is not (yet) there Storage

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 GOCDB Accounting Display - under development Looking at data for RAL-LCG2 Storage units are 1TB = 10^6 MB Tape Used + Disk Used = Total Sensor Drop Outs have been fixed Total Used Storage (TB) Tape Used Disk Used Storage

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 SRM at T1 ~200TB of disk (deployment problem in 2006) –~100% usage (problem for 2006 service challenges) –Castor 2.1 SRM at all T2s ~200TB of disk in total –~30% usage: difficult to calculate –dCache 1.7.0 and DPM v1.5.10 –Dedicated disk servers advised (storage should be robust) Need to make sure sites are running the latest GIP plugins (https://twiki.cern.ch/twiki/bin/view/EGEE/GIP-Plugins) New GOC storage accounting system being put in place being deployed at Tier-2s SRM v2.2 is being implemented: need to test interoperability Storage

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 Could also be 2006 T2 Resources As overheard at one T2 site..

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 A. Usability (Prequel) GridPP runs a major part of the EGEE/LCG Grid, which supports ~3000 users The Grid is not (yet) as transparent as end- users want it to be The underlying overall failure rate is ~10% User (interface)s, middleware and operational procedures (need to) adapt Procedures to manage the underlying problems such that system is usable are highlighted

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 Resource allocation Assign quotas and priorities to VOs and measure delivery, but further work required on VOMS-roles/groups within each VO VOMS provides group/role information in the proxy Tools to control quotas and priorities in site services being developed –So far only at whole-VO level –Maui batch scheduler is flexible, easy to map to groups/roles –Sites set the target shares –Can publish VO/group-specific values in GLUE schema, hence the RB can use them for scheduling Accounting tool (APEL) measures CPU use at global level (UK task) –Storage accounting currently being added –GridPP monitors storage across UK –Privacy issues around user-level accounting, being solved by encryption

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 User Support Becoming vital as the number of users grows –But modest effort available in the various projects Global Grid User Support (GGUS) portal at Karlsruhe provides a central ticket interface –Problems are categorised Tickets are classified by an on-duty Ticket Process Manager, and assigned to an appropriate support unit –UK (GridPP) contributes support effort GGUS has a web-service interface to ticketing systems at each ROC –Other support units are local mailing lists –Mostly best-effort support, working hours only Currently ~tens of tickets/week –Manageable, but may not scale much further –Some tickets slip through the net

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 Documentation & Training Need documentation and training for both system managers and users –Mostly expert users up to now, but user community is expanding –Induction of new VOs is a particular problem – no peer support –EGEE is running User Fora for users to share experience Next in Manchester in May 07 (with OGF) –EGEE has a dedicated training activity run by NeSC/Edinburgh Documentation is often a low priority, little dedicated effort –The rapid pace of change means that material requires constant review Effort on documentation is now increasing –GridPP has appointed a documentation officer GridPP web site, wiki –Installation manual for admins is good There is also a wiki for admins to share experience –Focus is now on user documentation New EGEE web site – coming soon

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 Alternative view? The number of users in the Grid School for the Gifted is ~manageable now The system may be too complex, requiring too much work by the average user? Or the (virtual) help desk may not be enough? Or the documentation may be misleading? Or.. Having smart users helps (the current ones are)

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Tony Doyle - University of Glasgow INFNGrid Meeting 20 December 2006 Conclusion A.What is the deployment status? (snapshot) See e.g. Performance of the UK Grid for Particle Physics http://www.gridpp.ac.uk/papers/GridPP_IEEE06.pdf for more info. http://www.gridpp.ac.uk/papers/GridPP_IEEE06.pdf B.Is the system usable? Yes, but more work required from end-user perspective C.What is the future of GridPP? Operations-led activity, working with EGEE/EGI (EU) and NGS (UK)

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